Maybe Bitcoin is the Altavista or Yahoo and the crypto-currency which is really going to strike it big is still ahead of us.
There are many supporters of bitcoin, it still has the largest user base. These users will try their to protect their interests and promote bitcoin.
Ethereum could be the next Google. It is a platform as well as a currency.
I do not know much about ethereum. But bitcoin has a more brighter future if we consider with any other crypto-currency. Bitcoin has more users and more transaction volume and all the above it has huge market cap. These are the things will make bitcoin more successful in near future.